Corbin Russwin CK4357 Storeroom/Closet Cylindrical Lock - Grade 1, Global Knob, Keyed

Corbin Russwin CK4357-KEYED Storeroom/Closet Cylindrical Knobset - Grade 1, Global Knob, Keyed, 1-3/8" to 2" Door Thickness

Commercial-Grade Storeroom Security with Deadlocking Latchbolt Technology

The Corbin Russwin CK4357-KEYED Storeroom/Closet Cylindrical Knobset is a Grade 1 commercial bored lockset engineered for demanding, high-use applications in commercial, industrial, and institutional environments. Featuring a deadlocking latchbolt operated by key in the outside knob or by rotating the inside knob, this lock keeps the outside knob always rigid while the inside knob remains always free, providing reliable storeroom-function security. Compatible with door thicknesses from 1-3/8" to 2" and a standard 2-3/4" backset, the CK4357 is part of the CK4300 Series, which is built with heavy wrought knobs lined with steel for impact resistance and internal parts that are zinc dichromate plated for corrosion resistance.

Professional Features & Benefits

• Door Thickness Compatibility: Designed for doors ranging from 1-3/8" to 2" thick, accommodating a wide variety of commercial door configurations.
• Standard Backset: 2-3/4" backset provides a universally compatible fit for standard commercial door preparations.
• Storeroom/Closet Lock Function: Deadlocking latchbolt is retracted by key in the outside knob or by rotating the inside knob; outside knob is always rigid and inside knob is always free for controlled access security.
• Heavy-Duty Construction: Heavy wrought knobs with steel liner deliver superior impact resistance, while zinc dichromate plated internal parts provide long-term corrosion resistance for extended service life.
• Robust Latchbolt: Features a 1/2" (13mm) stainless steel throw deadlocking latchbolt for reliable, secure latching in high-traffic commercial environments.
• Conventional 6-Pin Cylinder: Includes a conventional 6-pin cylinder and two nickel silver keys for enhanced key security and compatibility with standard keying systems.
• ANSI Curved Lip Strike Included: Ships with an ANSI curved lip strike measuring 4-7/8" x 1-1/4" x 1-1/4" lip to center for a complete, ready-to-install solution.
• Non-Handed Design: Non-handed configuration simplifies installation and reduces inventory requirements across mixed-handing door applications.
• Manufacturer Warranty: Backed by a 3-year warranty for added confidence and protection in commercial installations.

Technical Specifications

• Subcategory: Cylindrical Locks
• Product Group: Mechanical Locks
• Series: CK4300 Series
• Grade: Grade 1
• Keyed Function: Single Cylinder
• Lock Function Description: Deadlocking latchbolt by key in outside knob or by rotating inside knob. Outside knob always rigid.
• Standard Latch: 787F66 - Deadlocking 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal
• Standard Strike: ANSI Curved Lip 4-7/8" x 1-1/4" x 1-1/4" lip to center
• Warranty: 3 Year
• ANSI/BHMA: F86
• Product Subgroup: Bored Locksets
• Product Type: Knobsets
• Keyed: Yes
• Fasteners: Wood and Machine Screws
• Commercial/Residential: Commercial
• Lock Type: Cylindrical
• Handle Type: Knob
• Lock Function: Storeroom/Closet
• Product Attribute: Cylindrical Locks
• Product Model: CK4357
• Product Function: Storeroom
• Door Hand Direction: Non-Handed
• Door Thickness Range: 1-3/8" to 2"
• Product Category: Mechanical Locks
• Backset (Distance): 2-3/4"
• Department: Door Hardware

Installation & Operation

1. Review manufacturer specifications and verify door preparation requirements including door thickness (1-3/8" to 2"), backset (2-3/4"), stile width, and handing as applicable to this product.
2. Use manufacturer-provided templates to mark mounting hole locations accurately on door and/or frame surfaces.
3. Prepare door and frame by drilling required holes and routing as specified in manufacturer instructions.
4. Install the standard latch (787F66 - Deadlocking 2-3/4" Backset, Square corner front, 2-1/4" x 1-1/8" universal) and secure the ANSI curved lip strike (4-7/8" x 1-1/4" x 1-1/4" lip to center) to the door frame using the provided wood and machine screws.
5. Mount the cylindrical knobset assembly to the door per manufacturer torque specifications, ensuring proper alignment of the outside and inside knob components.
6. Test lock operation: verify the outside knob is rigid, the inside knob rotates freely to retract the latchbolt, and the key in the outside knob properly retracts the deadlocking latchbolt. Refer to manufacturer documentation for complete installation details and troubleshooting.

Professional Applications

• Schools and Educational Facilities
• Hotels and Hospitality Properties
• Apartments and Multi-Tenant Residential Buildings
• Hospitals and Nursing Homes
• Municipal Buildings and Government Facilities
• Airports and Transportation Hubs
• Retail Complexes, Offices, and Warehouses

Why Choose Corbin Russwin Quality?

Corbin Russwin CK4300 Series cylindrical locksets are built to Grade 1 commercial standards, featuring heavy wrought knobs with steel liners for impact resistance, zinc dichromate plated internal components for corrosion resistance, and a 1/2" (13mm) stainless steel throw deadlocking latchbolt for dependable security. Each unit is backed by a 3-year manufacturer warranty and meets ANSI/BHMA F86 standards, making it a trusted choice for demanding commercial, industrial, and institutional applications where long-term reliability is essential.